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Lessons (5)

• VPC Endpoints, Transit Gateway and Hybrid Networking

  … Successful access from a developer laptop does not prove private subnet access. Transit Gateway: routing is not automatic …

• Design a Chat Application

  … durable state transitions. Offline push comes from the durable event, not an in-memory gateway. Define the message …

• Multi-Account Strategy, Governance and Security Operations

  … Transit Gateway, shared egress and inspection. - Workload accounts : per team, per environment (dev, staging, prod). AWS Organizations and …

• Cost Optimization and the Well-Architected Framework

  … 2. NAT gateway data processing : add S3 and DynamoDB gateway endpoints; use interface endpoints for heavy services; keep …

• AWS Security Building Blocks

  … Use a maintained JWT verification library or a properly configured API Gateway authorizer. Base64-decoding the payload only …